Gate-valve.



H. M. LOFTON.

` GATE VALVE.

APPLIOATION FILED AUG. 9, 1911.

Patented Aug. 11, 1914u 2 SHEETS-SHEET 1.

H. M. LOFTON.

GATE VALVE.

APPLIOATION FILED AUG. s, 1911.

Patented Aug. 11, 1914.

2 SHEETS-SHEET 2.

| NWNQNN THE'NoRR/S PETERS C0.. PHOo-LITHD.. WASHINGTON. D. C.

- tra rinvii al -it sul@ HERBERT M. LGETGN, OF C "l'riNOGGi, TENNESSEE GATE-VALVE.

Specification. of Letters Patent.

Pat iited fitug'. it, 19M.

Application led August 9, 1911. Serial No.

an ,vein/en, in Gate-Valves, of which owing is a specification.

lilly inve ition has reference to gate valves and cons f ot certain improvements which c 'fully set out in the following specificaand shown in the accoinpanying` dravvwhich forni a part thereof.

ibject of iny invention is to provide a this character with a construction wir pei-init the valve pieces to be `-asily upon their seats or opened with l)ect tl erefioni and without rubbing uny against the contacting surfaces during the process of opening` or closing the valve; and iny object is further to provide in such valve a construction which will not obstruct the open area. between the inlet and the outlet ports of the valve, when the valve is fully open.

My invention embodies in its construction a` valve body having oppositely directed valve seats, and two independent valve pieces adapted to said seats, combined with independent cani devices, interposed between the valve pieces and movable to and frein each other for forcing the valve pieces in opposite directions whereby they close upon their respective seats or are released therefrom, cani operating ineans for causthe said independent cani devices to be inoved relatively to and 'from each other, and power implying means for operating the cani operating nieans last described for putting saine into operation when closing` the valve and out 01"' operation when opening` the valve.

My invention also comprehends the various features of construction and details which are all fully described hereinafter and incre particularly defined in the clainis.

Mv invention will be better understood by specific reference to the drawings, in which Figure l is a longitudinal sectional elevation ot a valve embodying my invention:

2 is a transverse sectional elevation of the sanie- Fie'. 3 is a transverse sectional a ci plan view of the saine through the port area oi the valve and with the inlet and outlets broken away; Fig. t is a. plan view of the valve and with the operating portion in section; and Figs. 5, 6, and "t" are perspective views ot details ot' the valve devices.

:2 is the valve body and provided with the inlet port 3 and outlet port Lt, each et' which inay be furnished with bronze or other lion-corroding metal seats These ports through the seats are adapted to be closed by valve pieces or disk are arranged to be nioved vertically under the action an @erating screw stein or spindle l2 and connecting' Aneans. The body oi the valve is open at the top and etvered with a bonnet lll having` at its upper part the stutling boi; structure 13 through which the operating.;l stein l2 extends. rihe stein l2 supported in the bonnet so as to capable of i fion but without vertical inoveinent, but it s inmaterial to iny invention how this provision may be made.

G, G, .which 7, 7, are two bronze parts for expanding t ie disks or valve pieces 6 against their 5, 5. These parts 7, 7, have on each end three beveled cani faces l?, 8 and 17', which contact with inclined cani faces 18 on the disks and with the cani faces ll and 1G of the nut l0 and wedge `body tivelv, and said parts 7, 7, are loose, but retained in relative posit-ion by their contacting` cani .tacos aforesaid.

,0 is a. threaded stein nut in which the stein l2 screws. The lower part of the stein nut is provided with the inclined cain pertions ll..

is a lower wedge body having' the cani. portions lt. The threaded stein nut l() has opposite notched portions 2O having lower shoulders and upper shoulde and these notches are also provided with four lugs 22 an(v 23, which will be referred to later on. The valve disks 6, 6, are each provid-ed with two lugs 2l, oppositely directed, and said l5 respechigs are undercut or slotted, as indicated at 21a. These disks are each also provided with four inclined planes or cani surfaces, distributed about the center, as indicated at 1S.

By referring to Figs. 2, 4, and G, it will be noted that the threaded stein nut iO is provided with the four projecting lugs arranged in the notched portions 2O and indicated at 22 and 28. These are best shown in Fig. 6. These lugs are staggered, the lugs 22 and 23 beingrespectively arranged Y cient play or In operation, 3, y to prov-io some means for i. ff per ends o the valve disks 1 ,i lliey are removed from posi, ,in 2.,; e i alve seats,

or more particularly, after t Lcy are moved into the vali-Je bonnet if-l. rlhis is accom` plished in the following manner: The stem nut l0 is placed in position open one of the disks (5 bv sliehtl inclinino' the nut so that M v j ill will enter into the recessed por- Y the lugs tions Q0 on the not; the said s nut is then brought 'nto a vertical. position and parallel with the valve disk, which will canse two the lugs 22 and 9,23 to take hold in the slots 2l. Von the said disk. Likewise, in placing the second valve disk'in position, the same is slightly inclined until its lugs 21 enter the recessed portions Q0 on the stem nut and after this is done, thew'alve disk is then brought to a vertical position with'the axis of the seem nutV 10, which will Ycause the other two lugs and to take hold in the slots 2la f this other disk. rlherefore, as the two valve disks ll, 6, are now in parallel position, and the si in nnt l0 is in position between tie two, it will be seen that by means of the four staggered logs and 23 and the slots 21 on the two valve disks the latter are held together,'allowing only suffe lost motion to permit them being pressed against the valve seats when it is necessary to close tie ports, or vice versa.

' ln operation, it will be seen that, by re- .'olvin` the stein 1&2, the threaded steinnnt 10 is lowered into the valvebody, andthe valve disks or pieces ti, hangingf upon the nut, are Ylowered with it to positions in front of the ports. During this operation the lower wedge body 15 comes in contact with the bottom of the valve body 2, as is indicated in Figs. il and 2, and at this time it is inte idealV that the valve pieces or disks shall be brought nearly opposite the valve ser ts. Any continued downward movement will cause the lower wed ge body 15 to press upwardly, forcing the cam surfaces 16 thereof against the inclined surfaces 9 of the parts 7, 7, as shown in Fig'. rllhis will causethe parts 7, 7, to move more slowly and in a transverse direction to the movement of thefvdisks and force their cam portions S in contact with the cam surfaces l1 on the stem nut 10'. lt will thns be seen that the parts e 7 beinel brought against the inclined surtion relatively to the movement of thedisks. eratin faces l1 and 1G at their ends will cause the v i g wedges i7 to move outwardly irom the line of the valve stem and in a transverse direcln doing this, the wedging surfaces 17 on the parts 7 will como in contact with the incline planes 1S on the valve pieces or disks (5 and thiis press the said valve pieces or disks outwardly from each other, and againstthe valve seats 5.

equal pressure against the Y four inclined planes on each of the valve pieces ordisks, and thereby vinsure that the valve disks will be pressed against the valve seats at lutely eoual pressure at four separate points of the circle of same. 1n opening the valve, the mechanism operates to release all pressure 'against the disks before they are moved.

u Y 1t willV also Vbe y seen that all of these wedging; surfaces be-V ing' co-dependent upon each other, will exertVV abso- Y rlChis is done in the following' manner: K

roi ating the mlvespindle erstem in an opposite direction, lne threadedstem nut l() 1s moved.upwardly, bringing the 'cam suriaces ll Aont of contact withgthe cainsurfaces 8..

if his immediately releasesall pressure from against the valve disks; anda still further upward movement of the stem nnt l()v will cause the lower shoulders of the notches' 20 on the same to come in contact with the lower side of the lugs 2l, on the valve disks, and continue to move themup, thus giving a Vclear passage through the valve.

Referring again tothe valvemechanism; l desire to state that the improved features of my invention embrace that of applying the pressure againstthe valve disk at'four separate points,

improvement over those valves where the pressure is ,applied only in the center of the valve disk. By my construction, the springing-of the valve pieces` or disks isabsolutely prevented, on account of applying the pressure at the four separate and equally divided points on 'the circle of the valve disk; and on account of the cri-dependent feature of tlieweclging surfaces employed, this pressure is at all times equal atfeach of the four points at contact.

Another important feature of my invention is the meansfor hol ding the upper ends of the valve disks together by means of the lugs and working' in the ,slots 21, or upon the outer parts of the lugs 21. 'Heretofore, it has been necessary toprovide some which is a very Ymaterial kind of links, requiringseparate bolts or othermeans to hold the valve disks together and tothe stem not, and 1 mfercoiioeV this difliculty in a very substantial and also a Y very inexpensive manner. A

l? rom the foregoing, it will be observed that the parts 7 with their cams '8 and 9 and wedges 17" act as independentV cam devices between the valvepieces or disks and are movable to and from each other for causing the disks to be moved to or from their seats; and likewise the stein nut 10 andV wedge body 15V having` their cam portions cope' with the parts 7 constitute cam operating means for causing the independent cam devices to be moved relatively to each other.

have shown my invention in the form l have found excellently adapted for commercial practice and While l prefer the construction shown, l do not restrict myseli to the details, as they may beV modified Without departing from the spirit of the invention.

Having noiv described my invention, what l claim new and desire to secure by Letters Patent, is:

l. ln a gate valve, the body portion having oppositely directed inlet and outlet ports and valve seats arranged in alinement7 combined with tivo valve disks for the re spective valve seats each having aplurality of cam surfaces on opposite sides of a diametrical luie, independent cam `devices arranged between the disks and at l tin es out of operative Contact Wit-h the body portion and each having four contacting parte for cooperating With a corresponding number of cam surfaces on the disks iviereby said disks maybe positively moved at their upper and lovver portions simultaneously into contact with the valve seats cam operating means independent of the cam devices and the body portion for causing the devices to be positively moved transversely to the movement of the disks both at top and bottom, and power applying means for operating the cam operating meansn in a gate valve, the body portion having oppositely directed inlet and outlet ports and valve seats arranged in alinement7 combined with tivo valve disks for the respective valve seats each having a plurality of cam surfaces above and below a diametrical line cam devices comprising independent parts out oit operative contact ivith the body portion and movable to and from each other transversely to the direction of movement of the disks and having cam portions at upper and lower parts making contact with the canisuri'iaces ot' the disks above and below the diam 'ric-al, line for forcing the disks apart and against their respective seats, cani opera ting means independent ci the cani devices for causing the cam devices to be positively moved both at top and bottoni transversely to the movement of the disks to make them positively operative upon the disks to the saine extent both at the upper and loiver parts thereof, and power applying moans for actuating the cam operating` means.

3. ln a gate valve, the body having oppositely directed inlet and outlet ports and valve seats arranged in alinement, ceinbined -`rvith tivo valve disks for the respective valve seats each having four cam surfaces, cam devices comprising a plurality olil laterally movable parts each having cams on both ends and arranged between the disks and cooperating with the cam surfaces thereof for forcing' the disks apart and against their respective seats equally at their upper and loiver portions, cani operating means independent ci' the y'alve body for causing the cam devi-ces to be moved to ineke them operative upon the disksj said means adjust-ably connected with the disks and also acting to hold the cani t ices in position between the disks While permitting i A l' u the fainst A' ha s pressing u`r places center of inwardly directed iniertions, cani mating means l devices to be moved to Wedge por p 1 ara .Viry disks am eiuied ca for caus'r p fable toivart.; or fr in caen other am i iii-ovably connected ivith the disks and also liaviin.; cani surfaces co-acting with the inwardly directed cam surfaces oit the cam devices7 one ot these parts being arranged have its movement arrested by the valve body, and power applying means iter operating the other parts of the cam oerating means.

o. in a gate valve, the combination of a boly having oppositely directed inlet and outlet ports and valve seats arranged in alineineiit, with tivo valve disks for the respective valve seais said disks cach having a plurality of ain surfaces and said valve disks each provided with suspending lugs having recesses parallel to the plane ot the disl-s,y cam devices comprising independent movable paris arranged het veen the cam dist1 and havn gj cam surfaces cooperating ivith the cam surfaces upon the disks said cam devices movable toward or from cach other transversely to the direction oi' movement of the disks in opening and closing the valve. cam operating means for causing the cam devices to be moved trai aversi-ly tothe inoveii'ient of the disks to make them operative upon the disks said means being` pro vided with recessed portions ot greater vertical width than the thickness of the lugs on the disks a d provided with lugs to en- 11. I, m I 1 m t 1.yv.

gz ge ine recesses el me lugs et the uislis to hold the disks to the cam operating means,

and power applying ineens Jlj'or operating the cznn operating ineens.

G. ln e gate valve, the combination oi the g inlet :ind outlet ports and valve er, with tivo valve disks for the cti-ire vulve seats seid disks each having heir tippe part inwardly directed lugs "orinef vwith vertical recesses betweentheni the disks, a nut provided with oppo- .viitrljf' directed transverse recesses for receiv- 'i lhe lugs of the disks said recesses proidefi with lugs at their opposite ends to enthe recessed portions of the lugs of the i -fl said lugs in erich of the recesses of Y beingl arranged zit different eleva- :ind n screw for raising and lowering s and the disks supported thereby, the construction beine; such that the disks may be locked to the nut bv -tnrninoN thein at an :ingle :ind sliding` them into the recesses ofthe nut.

i'. ln zi gate valve, an operating nut i'or Vthe vulve disks, which consists ot' s body mrt provided with ogpositely directed transif'erse recesses 2O having et their dizigonnlly opposite corners shallow lugs 22 and 23, combined with disks having lugs 21 'formed with vertical recesses 2l for engaging,` the oppositely directed recesses of the VCopies of this patent may be obtained for ve cents each, by addressing the nut Vback ot the lugs of said recesses, and ineens for raising and lowering the nut.

8. ln :i gate valve, the body having voppositelir directed inlet and outlet ports and valve seats therefor, combinedV with two valve disks for the respective valve seats, tivo independent parts between the disks and movableV away from each Vother transversely to the direction of movement of the vfilvedisks in closing the valve and cozicting,l 1with the said disks for forcing them apart, ieans carried by the valve disks at their low-er parts adapted. to 'be supported by the bottoni of the valve body and against which the independent parts are pressed to impart to their :t transverse movement, ineens arranged et the upper part ofthe valve disks lnd between thcni for acting upon the independ-ent parts for movingv them transversely apart and also ior snp-porting the disks, and Y en operating screw the last mentioned ineens. Y l. y Y

ln testimony of which invention, I heref unto set niy hand.

HERBERT M. LOFTON.

lllitnesses Y `W.` J. Denon,

l. J. CRIMMINS.

" Commissioner rof Patents,

Washington, '.D. C.

foriraisin" and loiverino 

